Stage files for commit after ejecting (#5960)

* add command to add files to staging after eject

* update console.log message

* wrap git add in a try/catch block

* return true & update log message

* add test to check if files were staged

* Fix check for staged files

packages/react-scripts/scripts/eject.js

@@ -38,6 +38,22 @@ function getGitStatus() {
   }
 }
 
+function tryGitAdd(appPath) {
+  try {
+    spawnSync(
+      'git',
+      ['add', path.join(appPath, 'config'), path.join(appPath, 'scripts')],
+      {
+        stdio: 'inherit',
+      }
+    );
+
+    return true;
+  } catch (e) {
+    return false;
+  }
+}
+
 console.log(
   chalk.cyan.bold(
     'NOTE: Create React App 2 supports TypeScript, Sass, CSS Modules and more without ejecting: ' +
@@ -310,6 +326,11 @@ inquirer
     console.log(green('Ejected successfully!'));
     console.log();
 
+    if (tryGitAdd(appPath)) {
+      console.log(cyan('Staged ejected files for commit.'));
+      console.log();
+    }
+
     console.log(
       green('Please consider sharing why you ejected in this survey:')
     );

tasks/e2e-simple.sh

@@ -269,6 +269,9 @@ verify_module_scope
 # Eject...
 echo yes | npm run eject
 
+# Test ejected files were staged
+test -n "$(git diff --staged --name-only)"
+
 # Test the build
 yarn build
 # Check for expected output